CN100582813C - Radar protection device for wireless networks and method - Google Patents
Radar protection device for wireless networks and method Download PDFInfo
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- CN100582813C CN100582813C CN200580024457.5A CN200580024457A CN100582813C CN 100582813 C CN100582813 C CN 100582813C CN 200580024457 A CN200580024457 A CN 200580024457A CN 100582813 C CN100582813 C CN 100582813C
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/20—Countermeasures against jamming
- H04K3/22—Countermeasures against jamming including jamming detection and monitoring
- H04K3/224—Countermeasures against jamming including jamming detection and monitoring with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer
- H04K3/226—Selection of non-jammed channel for communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
- H04K3/822—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection by detecting the presence of a surveillance, interception or detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K2203/00—Jamming of communication; Countermeasures
- H04K2203/10—Jamming or countermeasure used for a particular application
- H04K2203/18—Jamming or countermeasure used for a particular application for wireless local area networks or WLAN
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A method for radar protection. The method includes recording energy events and calculating differences in recorded energy events to determine pulses. The method further includes sorting intervals between pulses into histogram bins, each bin representing a range of time intervals between two pulses, each pulse indicative of a radar frequency and limiting network traffic on a frequency based on a selected bin count.
Description
Technical field
Relate generally to wireless network of the present invention more specifically, relates to the radar protection device and the method that are used for wireless network.
Background technology
Current and the expection growth that is operated in no license (unlicensed) wireless device that is arranged in about 5GHz frequency band has impelled country and international standard group issue to guarantee to be able to minimized standard with the interference of existing system.This no license wireless device uses packetized data usually, and includes but not limited to the wireless device according to Institute of Electrical and Electric Engineers (IEEE) 802.11 standards.This standard is usually partly owing to military affairs of normally carrying out in frequency band and meteorological radar operation.Usually, the operation of the more no license equipment in the frequency band has increased the chance of disturbing, and has promoted the noise-floor of frequency band, thereby may weaken the operating performance of military and weather radar system.
For example, ETSI (ETSI) and Federal Communications Committee (FCC) have announced the demand at radio lan (RLAN) equipment, in no license national information infrastructure (U-NII) frequency band of this equipment work between 5.250-5.350 and 5.470-5.725GHz.In addition, this equipment need adopt a kind of like this mechanism, and this mechanism allows equipment not share frequency spectrum with mode and radar operation that radar operation (particularly military and meteorological radar operation) is disturbed mutually with equipment.
Under the situation that lacks needed frequency spectrum share, a kind of method has been reported the measurement summary in the wireless communication system.More specifically, in case intrasystem transfer table is tuned to selected frequency range, just communication energy is measured.If measure or detect communication energy, then whether the energy decoding is comprised packetized data with definite communication energy.If detect packetized data, then grouping is further analyzed to determine that whether packetized data is according to Institute of Electrical and Electric Engineers (IEEE) 802.11 standards to data.If determine that packetized data is 802.11 packetized datas, then measure summary field and be filled, the frequency range that this value indication transfer table is tuned to a certain value.Otherwise, indicate 802.11 packetized datas on the frequency range that transfer table is tuned to, not transmit.This method uses quite complicated delay correlation technique to carry out this judgement.Although this method has been reported the measurement summary of transfer table, comprise whether the transmission of power on the characteristic frequency is 802.11 packetized datas, this method fails to provide the radar protection system that is used for wireless device that allows wireless network and radar system coexistence.
Yet another kind of method but allows the coexistence of wireless network and radar system.More specifically, this method provides the detections of radar and the dynamic frequency that are used for WLAN (wireless local area network) to select.In addition, this method comprises radar detection process, and this process is carried out the frequency-domain analysis of input signal to derive phase place and amplitude information, and its output is assigned in the case (bin) of 52 300kHz.Analyze case to discern and to distinguish dissimilar radars, for example continuous wave tone radar and linear FM radar (wherein pulse is by inswept a certain frequency range).When radar was arranged, power generally concentrated in a certain case, perhaps concentrates on the characteristic frequency.
This method also provides analysis to grouping to determine whether any spike (spike) that surpasses a certain threshold value is arranged in grouping, because spike may be indicated radar signal.Analyze the amplitude and the duration (being pulsewidth) of spike and whether indicate radar signal with definite this spike.Spike in the grouping can be coupled with timestamp so that spike can be considered new or independent incident.
In case by the length of incident and the frequency-domain analysis of amplitude are determined that particular event is a radar signal, this method is then also determined the cycle of signal.Similarly, frequency-domain analysis is used to determine the cycle of signal.Particularly, this method is used aforesaid radar detection process at the access point place, if access point detects the existence of radar signal, then access point changes channel.Although the radar protection system that is used for wireless device that allows wireless network and radar system coexistence is provided, the purposes of the radar detection process that is associated with this method but is limited.At first, use fast fourier transform, discrete Fourier transform (DFT) or time-domain analysis especially to bother.The analysis of all these types all needs powerful calculating and processing power.And this processing may spend the considerable time.In addition, intrinsic ability is not enough to allow to use this alanysis usually in the current access point.Therefore, many existing access points can not use the analytic process that is associated with this method.
Thereby, need a kind of code requirement that solved, and allow the radar protection device and the method for wireless network and radar system coexistence.
Summary of the invention
The invention solves code requirement, and allow the coexistence of wireless network and radar system.More specifically, the existence of scanning radar signal of the present invention, and when detecting radar signal, limit the transmission of Wireless Communication Equipment on the same frequency, thus reduced interference with radar system, and protected the operation of radar system.
According to the present invention, a kind of method that is used for the radar protection is disclosed.This method comprises the record energy events, the mistiming of calculating in the energy events that writes down exists with definite pulse, interval between the pulse is categorized into (each case is represented the scope in two time intervals between the pulse) in the histogram bins, and when the case number in one or more casees is counted above selected case, determine to detect radar signal and limited network traffics on the frequency of this radar signal, wherein, the case numerical table of each case shows the frequency at interval between two pulses in the scope that falls into this case representative.
In addition, according to the present invention, a kind of radar protection device is disclosed.This equipment comprises acceptor circuit and the receiving antenna that is configured to write down energy, and is coupled to acceptor circuit and is configured to carry out the controller that allows with the program code of the coexistence of radar system.Program code comprises the instruction of the following operation of instruction control unit execution: the mistiming of calculating in the energy events that writes down exists with definite pulse, and the interval between the pulse is categorized in the histogram bins, each case is represented the scope in two time intervals between the pulse.This equipment also comprises transtation mission circuit and the transmitting antenna that is coupled to controller.Program code also comprises the instruction of the following operation of instruction control unit execution: when the case number in one or more casees is counted above selected case, determine to detect radar signal and made transtation mission circuit limit the network traffics on the frequency of this radar signal, wherein, the case numerical table of each case shows the frequency at interval between two pulses in the scope that falls into this case representative.
In one aspect of the invention; a kind of device that is used for the radar protection; comprise the device that is used to write down energy events; be used for calculating the device of mistiming to determine that pulse exists of the energy events of record; be used for the interval between the pulse is categorized into the device (each case is represented the scope in two time intervals between the pulse) of histogram bins; and be used for case number in one or more casees and surpass the device of having determined to detect radar signal when selected case is counted and having limited the network traffics on the frequency of this radar signal; wherein, the case numerical table of each case shows the frequency at interval between two pulses in the scope that falls into this case representative.
Like this, provide a kind of radar protection device and method that has solved code requirement and allowed the coexistence of wireless network and radar system.
Those skilled in the art will be from the following description understand these and other purpose and advantage of the present invention at an easy rate, in the following description, the mode that only is suitable for carrying out one of optimal mode of the present invention by explanation illustrates and has described the preferred embodiments of the present invention.Will recognize that the present invention can have other different embodiment, and its some details can make amendment various aspect obvious, all these does not break away from spirit of the present invention.Therefore, accompanying drawing and description should be counted as illustrative, and nonrestrictive.
Description of drawings
The accompanying drawing that is incorporated into this and has constituted the part of this instructions illustrates embodiments of the invention, and with provide above to general description of the present invention and detailed description given below, be used for illustrating principle of the present invention.
Fig. 1 is according to the WLAN (wireless local area network) that comprises a plurality of access points of principle of the present invention and the block diagram of radar system;
Fig. 2 is the diagram by the typical radar signal of the transmission of the radar system shown in Fig. 1;
Fig. 3 is the functional block diagram according to the part of the typical access point of principle of the present invention;
Fig. 4 is the diagram of type signal of the operation of the access point shown in the index map 3;
Fig. 5 is the time diagram of the operation of the access point shown in Fig. 3;
Fig. 6 is the histogram in the recurrent interval shown in Fig. 5;
Fig. 7 is the functional block diagram according to the access point of principle of the present invention; And
Fig. 8 is the process flow diagram of program flow of the method for the diagram radar protection device that is used for the access point shown in Fig. 1,3 and 7.
Embodiment
Describe now accompanying drawing, wherein similar label refers to similar parts, and the WLAN (wireless local area network) 100 that is configured to provide with the wireless data communications of transfer table 102 is provided Fig. 1.In addition, WLAN (wireless local area network) 100 and transfer table 102 are worked at the frequency band that is arranged in about 5GHz according to Institute of Electrical and Electric Engineers (IEEE) 802.11 standards.More specifically, WLAN (wireless local area network) 100 requires work according to ETSI (ETSI) and Federal Communications Committee (FCC) at what the no license wireless device in no license national information infrastructure (U-NII) frequency band that is operated between 5.250-5.350 and the 5.470-5.725GHz was announced.In addition, WLAN (wireless local area network) 100 comprises radar protection device, and this equipment allows network to share frequency spectrum with radar operation (for example, military and meteorological radar operation) by this way, and this mode makes network can not disturb radar operation.
For this reason, WLAN (wireless local area network) 100 comprises one or more access point 104a-n, and wherein " n " refers to any actual number of access point.Access point 104a-n advantageously utilizes fixed backbone network 106 interconnection.As shown in the figure, in operation, packetized data utilizes the Radio Link 108 between transfer table 102 and the selected access point 104a to transmit.More specifically, utilize packetized data that Radio Link 108 sends to transfer table 102 to send being collectively referred to as on the channel of forward link channel by access point 104a, and the packetized data that is sent to access point 104a by transfer table 102 send being collectively referred to as on the channel of reverse chain channel.
It will be appreciated by those of ordinary skill in the art that access point 104a-n also can advantageously be exclusively used in or be used as bridge.In bridge application or configuration, access point 104a-n mainly is exclusively used in the radio communication with another access point.In this configuration, the general oriented antenna of concentrating one's gaze on or point to another access point that uses of access point 104a-n provides additional gain and selectivity.The access point 104a-n that is configured to bridge does not communicate by letter with transfer table 102 usually.Thereby the present invention is not limited to the access point 104a-n with mobile communications; On the contrary, the present invention includes the access point that is configured to bridge.
In no license national information infrastructure (U-NII) frequency band between 5.250-5.350 and 5.470-5.725GHz, forward direction and reverse chain channel are not assigned to particular system.In other words, WLAN (wireless local area network) 100 is not assigned with a part with frequency band for its special use.On the contrary, WLAN (wireless local area network) 100 must be shared frequency band with other systems of working simultaneously (particularly radar system).Radar system includes but not limited to be usually operated at military affairs and the weather radar system in the frequency band, with label 110 an exemplary radar system is shown.In order to prevent the same section of service band simultaneously, according to current requirement of being announced by Federal Communications Committee and ETSI, the system that is operated in the frequency band will adopt the dynamic frequency selection scheme.
Whether in general, in the dynamic frequency selection scheme, just used by another system based on channel, the channel in the Dynamic Selection frequency band is for use.More specifically, according to an aspect of the present invention, if channel is just used by radar system (for example radar system 110), then access point 104a-n selects another channel to be used for data communication.In addition, when the dynamic frequency selection scheme used according to instruction of the present invention, radar system 110 and WLAN (wireless local area network) 100 can not used same channel.
Radar signal is characterised in that the burst of the recurrent pulses of radio-frequency (RF) energy.These pulses are because it periodically and relative to the pulsewidth of lacking, thereby can be different from wireless network transmissions.The number and the time period between the pulse of pulse are different for dissimilar radars.Except this difference, the number and the time period between the pulse of pulse can be by parametrizations.With reference to figure 2, show exemplary radar signal 200 by radar system 110 transmissions of Fig. 1.Radar signal 200 is included in a series of pulses 202 that receive in a series of bursts, and two bursts in a series of bursts are illustrated as label 204 and 206 respectively.Burst 204,206 is separated by being often referred to the time period that is shown label 208.Sine wave or the modulating wave of high frequency (promptly about 5GHz) represented in each pulse 202, and it has duration of pulse or the pulsewidth (PW) that is about 1 to 20 microsecond.Yet the pulsewidth of hundreds of microsecond also is known.Time period between the beginning of continuous impulse is called as the recurrence interval, and is the inverse of pulse repetition rate (PRF), is designated as (1/PRE).Burst-length (BL) is the number of pulse 202 in the burst 204,206, perhaps is equal to 204,206 times that spent of burst of pulse 202.Burst interval (P) is two times that spent between two equivalent reference points in the burst 204,206 continuously, and generally at about 1-60 between second.
Thereby as shown in Figure 2, radar signal 200 is characterised in that recurrent pulses and periodic burst, and by parametrization correspondingly.The rotation radar signal that those skilled in the art will appreciate that radar signal 200 illustrations, and the tracking radar signal can not show as periodic burst.Yet the present invention also is applicable to the periodic tracking radar signal that utilizes between the pulse.With reference to Fig. 1 and 2, according to an aspect of the present invention, the cyclophysis of radar signal 200 is used for discerning transmission from radar signal 110 by WLAN (wireless local area network) 100.More specifically, the access point 104a-n in the WLAN (wireless local area network) 100 are arranged to by comprising that radar protection device realizes the radar protection.
Forward Fig. 3 to, show the block diagram of the receiver part of typical access point 300 (for example, the access point 104a-n shown in Fig. 1) according to principle configuration of the present invention.As shown in the figure, access point 300 comprises the receiving antenna 302 that is coupled to bandpass filter 304 and low noise amplifier 306, is used to receive the packetized data on the reverse chain channel.Access point 300 also comprises the mixer 308 that is coupled to low noise amplifier 306 and relevant local oscillator 310 in response to controller 324, be used for be tuned to or selective reception frequency or channel.A series of bandpass filter 312,316 and amplifier 314,318 are coupled to mixer 308 and analog to digital converter 322, and have finished RX path 338.According to an aspect of the present invention, RX path 338 is used to detect radar signal.
As shown in the figure, 802.11 physical interface controllers 334 comprise analog to digital converter 322,332, controller 324, blanking (blanking) 326, gating (gating) 328 and detection and add timestamp 330.
In operation, as connect shown in 336, amplifier 306,314 and 318 source current are integrated, and are coupled to analog to digital converter 332.The integration of source current has formed received signal intensity indication (RSSI) signal.According to an aspect of the present invention, on a period of time, use one or more receiving signal intensity indication signals to detect radar signal.More specifically, when RX path 338 receives signal, and the indication receiving signal intensity indication signal greater than threshold value (for example, greater than-64dBm) time, detect and add timestamp 330 and in storer, store or recording events.For example, the incident in the storer can be stored as four 16 continuous words.In addition, two lower words can write down information and other information about event type, and two higher words are 32 (rotation-roll type) timer countings of incident reality constantly.Controller 324 can operate be used for handling storage or the incident in the storer of being recorded in to detect radar signal, as below describing.When blanking 326 and gating 328 are used for access point 300 transmissions or receiving block data, so that the packetized data that sends and receive is not recorded.
With reference to figure 4, illustrate the type signal 400 of the operation of the access point 300 shown in the index map 3.Access point 300 can receive usually amplitude range approximately-94 and-signal between the 20dBm, shown in the longitudinal axis or y axle.Signal greater than-20dBm generally makes the RX path 338 of access point 300 too drastic or saturated.Time indicates on transverse axis or x axle usually.It will be appreciated by those of ordinary skill in the art that the present invention is equally applicable to have the access point of different receiving sensitivities.
As mentioned above, signal 400 comprises part 402,404, and wherein access point 300 is sending and receiving packetized data respectively.Will appreciate that part or divide into groups 402,404 not need to have and equal-amplitude of 64dBm; On the contrary, this amplitude only is for convenience of explanation.The duration of the integrated data that sends and receive is usually between about 24 microseconds and 1.5 milliseconds.During these time periods 402,404, RX path 338 is by blanking effectively.Will appreciate that in certain embodiments, the major part in the same RX path 338 both had been used for detections of radar, was used for the branch group of received again.In these embodiments, have only the detections of radar path, and access point receives grouping by blanking.
Will appreciate that access point 300 comprises the adaptation to distributed coordination function interframe space (DIFS) and random back (backoff); In this case, be used to send with the period that receives packetized data be different.In addition, access point 300 can comprise to before each transmission packets, between or the adaptation of afterwards " very period " (quite period).
Sending and receiving between the packetized data, access point 300 utilizes RX path 338 " to intercept " radar signal during clear channel estimating.Be used to intercept or the exemplary period of clear channel estimating is shown label 406 and 408 usually, and detected radar spike or signal are with label 410 indications.In general, radar signal 410 is the pulses that are about 4 microseconds the duration; Yet the pulse that the duration reaches the hundreds of millisecond also is known.
In order to detect radar signal, signal surpasses threshold value.For example, radar signal 410 surpasses-threshold value of 64dBm, shown in arrow 412 and 414.It will be appreciated by those of ordinary skill in the art that this threshold value can be set as any suitable power level on demand.
With reference to figure 5, illustrate the time diagram 500 of the operation of the access point 300 shown in Fig. 3.Usually, instruction time on transverse axis or x axle, indicated power or amplitude on the longitudinal axis or y axle.More specifically, time diagram 500 shows the packetized data 502,504 that sends and receive respectively, and series of periodic radar bursts or pulse 506,508,510,512,514 etc.Shown in the dotted line at label 516 places, some " shake " or temporal variation easily take place in radar pulse 506,508,510,512,514 etc.According to an aspect of the present invention, (binning) allowed this shake in the detections of radar by " branch mailbox " that hereinafter illustrate.
When detecting radar signal, be left in the basket in the transmission of packetized data or the received signal intensity indication incident of reception period.In addition, too narrow or too wide pulse is left in the basket, and the pulse with too big wide variety also is left in the basket.Exemplary pulse too narrow or too wide or that have a too big wide variety is illustrated by label 518.Thereby packetized data 502,504 that sends and receive and exemplary pulse 518 are removed from spectrogram 500.Will appreciate that radar pulse 512 is also removed effectively with the packetized data 504 that receives.As shown in hereinafter, although removed radar pulse 512, the present invention still can detect the operation of radar system.
In case removed the packetized data 502,504, pulse 512 and the exemplary pulse 518 that send and receive, the interval between the radar pulse 506,508,510,514 etc. just is designated as A1, A2, B and A3 respectively.Will appreciate that A1, A2 and A3 are similarly at interval, and B is longer at interval, this is owing to removed pulse 512 and packetized data 504.According to a further aspect in the invention, the interval between the too narrow or too wide pulse is dropped; Because these do not indicate radar signal at interval usually.
With reference to figure 6, utilize and in storer, set up histogram 600 at interval.Sort memory advantageously is included in the special IC 334, perhaps is included as the part of controller 324, and these two parts are all shown in Figure 3.In other embodiments of the invention, can use the storer of special IC or controller outside.
More specifically, histogram 600 comprises a plurality of casees, and for example case 602,604, refers to along the interval between two pulses of transverse axis or the arrangement of x axle.Case 602,604 has covered an interval usually, for example is respectively 200-250 microsecond and 400-500 microsecond.Fall into the frequency at the interval between two pulses in the scope, for example " case number (bin count) " illustrates on the longitudinal axis or y axle.It will be appreciated by those of ordinary skill in the art that the case that can use any number with any desired scope.
As shown in the figure, interval A1, A2, B, A3 are by branch mailbox.Thereby case 602 comprises A1, A2 and A3 at interval, and case 604 comprises B at interval.In case it is several 606 that the countings in the one or more casees 602 have surpassed specific case, access point 300 just no longer continues to use frequency or the channel related with these pulsion phases, and carries out dynamic frequency selection (DFS), thereby adopts another available channel.When it will be appreciated by those of ordinary skill in the art that case several 606 can be regulated on demand to change detects radar signal or how soon to detect radar signal.
For example, a kind of standard that can be used for detecting radar signal is if being less than the case of given number is filled with at interval and in the case number any one greater than a certain number, then carries out dynamic frequency and selects.This standard has prevented wrong detections of radar.Have been found that if the spacing respective tank number of case with the Gaussian distribution followed closely, then radar signal does not exist; On the contrary, access point 300 is detecting the transmission of himself.Thereby, have the Gaussian distribution followed the case number spacing closely case should be left in the basket.In this case, case 602,604 should be eliminated, resets or empty.Similarly, case 602,604 can periodically be emptied or be emptied when detecting radar signal.
With reference to figure 7, show the functional block diagram of access point 700 (for example, the access point 104a-n shown in Fig. 1) according to principle of the present invention.More specifically, access point 700 comprises RX path 702 that is used to receive the packetized data on the reverse chain channel and the transmit path 704 that is used for sending packetized data on forward link channel.RX path 702 comprises antenna 706, low noise amplifier 708, frequency conversion 710, modulus (A/D) converter 712 and physical interface (PHY) controller 714.RX path 702 also comprises automatic gain control (AGC) circuit 716 that the received signal intensity feedback signal is provided.Similarly, transmit path 704 comprises physical interface controller 714, digital-to-analogue (D/A) converter 718, frequency conversion 720, power amplifier 722 and antenna 724.Physical interface controller 714 utilizes switch 726,728 to select between RX path 702 and transmit path 704, shown in label 730.Local oscillator 732 is used for selecting to send and receive channel.
Physical layer interface controller 714 is special IC advantageously, and moves for example clock of 40MHz clock (not shown) and so on.In other embodiments, physical layer interface controller 714 can comprise analog to digital converter 712 and digital to analog converter 718.In addition, physical layer interface controller 714 is carried out modulating/demodulating.
Physical layer interface controller 714 is coupled to MAC controller (MAC) 734, processor 736 and network 738.MAC controller 734 is special IC equally advantageously.Network 738 is fixed backbone network, for example the fixed backbone network shown in Fig. 1 106.
The function of processor 736 control access points 700, for example, transmission that is associated with Radio Link and reception.Processor 736 is coupled to and receives and transmit path 702,704 and local oscillator 732, and carries out the stored program code that finds in storer 740.Thereby, processor 736 is programmed to record and/or manages detected radar signal, and select communication channel being used for fl transmission, thereby and select the client return link, so that prevent and radar system produces and disturbs with the variety of way that depends on its stored program code.It will be appreciated by those of ordinary skill in the art that in alternative embodiment processor suitably comprises storer.In other embodiments, storer is the outside of access point 700 or be not the part of access point 700.Processor 736 detects radar signal in the following manner: the record energy events, the mistiming of calculating in the energy events that writes down exists with definite pulse, interval between the pulse is categorized in the case of histogram, wherein each case is represented the scope in two time intervals between the pulse, a certain radar frequency is indicated in each pulse, and based on the network traffics on the selected case number restriction radar frequency.
Consider said structure and functional character, will recognize the method for various aspects better according to the present invention with reference to figure 8.Although purpose for simplified illustration, the method of Fig. 8 is illustrated as and is described as order and carries out, but be to be understood that and recognize, the present invention is not limited to order illustrated, because according to the present invention, some aspect can be by shown in being different from here and occurring in sequence of describing and/or take place simultaneously with other aspects.And the method according to an aspect of the present invention that will realize does not need all illustrated features.In addition, method of the present invention can realize in the combination of software, hardware or software and hardware.
With reference now to Fig. 8,, shows the process flow diagram of the program flow of the method 800 that illustrates the radar protection device that is used for wireless network.Method 800 starts from frame 802 energy events being write down (for example, detect, add timestamp and/or charge to daily record).Here used energy events comprises from transmission of radar system (for example radar system shown in Fig. 1 110) or the like.
For example, energy events suitably writes down (shown in Fig. 3) by RX path 338 in response to controller 334, perhaps writes down (shown in Fig. 7) in response to processor 736 by RX path 702.More specifically, having the energy events that rises to the energy level that exceeds a prescribed threshold value and drop to the energy level that is lower than assign thresholds is recorded.With reference to figure 2, this assign thresholds is shown reference letter T usually.And, thisly exceed and be lower than the rising of assign thresholds T and falling event corresponds respectively to the leading of pulse 202 and hangover edge, always indicate as label 210 and 212.Surpass similarly ,-radar signal 410 (always indicating as arrow 412 and 414n) of 64dBm threshold value is shown in Figure 4.
Still with reference to figure 8, at frame 804, the mistiming of calculating in the energy events that writes down exists with definite pulse.For example, the difference of the timestamp between the appropriate section (for example leading edge) of pulse 506,508,510,514 etc. is used to counting period A1, A2, B, A3, as shown in Figure 5.At frame 806, the interval between the pulse of go beyond the scope (for example, too narrow or too wide) is dropped, because these do not indicate radar signal at interval usually.
At frame 808, the interval between the pulse is classified in the histogram that comprises a plurality of casees.Each case of histogram is represented the scope in two time intervals between the pulse.Fig. 6 shows exemplary histogram 600.Accumulation representative in the single case of histogram has periodic interval in equaling the error allowance of case scope.
At frame 810, histogram is periodically reset, that is, all accumulations in any case of histogram all are dropped.For example, approximately each hundred milliseconds, all casees are all suitably reset once.Perhaps, the oldest clauses and subclauses in the case are eliminated, and for example those are older than for example 750 milliseconds clauses and subclauses.(for example, the case shown in Fig. 6 several 606 any case of) histogram is indicated the existence of the similar pulse of a plurality of spacings, and these a plurality of pulses are relevant with the high probability that receives radar signal to surpass appointment case number in reset stage.Usually, from case, periodically reset or remove the error-detecting that old clauses and subclauses have prevented radar signal.
At frame 812, utilize case number in the histogram as the indication of detections of radar, limit or stop at the transmission of the interference wireless network traffic on the detected frequency, thus the interference of minimizing or removal and radar system.In order to distinguish radar system transmissions and high-frequency impulse at random, the measurement between pulse stops wireless network traffic when concentrating in the small number of histogram bins at interval, thus since the periodicity of radar signal incoherent detection is kept apart with relevant branch mailbox.Method 800 finishes in frame 814.
In order to make wireless network successfully share frequency spectrum with radar system, radar signal must be detected apace, efficiently and exactly.When comparing with the method for using Fourier or periodic transformation, preceding method needs relatively low computing, thereby causes high detection speed and low false alarm rate.In addition, preceding method is healthy and strong when incoherent detection noise exists, and is easy to by the difference of parametrization with the reply radar system.
Consider aforementioned content, a kind of radar protection device and method are provided, it has solved code requirement, and allows wireless network and radar system coexistence.
Although illustrated native system by describing embodiment, and described in detail embodiment, applicant's intention is not or to be limited in these details by any way with the range constraint of claims.Additional advantage and modification are very clearly for those skilled in the art.Will be understood that the present invention can be applicable to the wireless network of any use packetized data.And this network is not limited to be operated in any special frequency band; On the contrary, can be operated in any frequency on demand.In addition, the present invention is not limited to carry out work according to any standard or standard.Therefore, its widely aspect, the present invention is not limited to specific detail, representative device and illustrated examples shown and that describe.Therefore, can make amendment, and not break away from the spirit or scope of applicant's general creative notion these details.
Claims (27)
1. one kind is used for the method that radar is protected, and comprising:
The record energy events;
The mistiming of calculating in the energy events that writes down exists with definite pulse;
Interval between the pulse is categorized in the histogram bins, and each case is represented the scope in two time intervals between the pulse; And
When the case number in one or more casees is counted above selected case, determine to detect radar signal and limited network traffics on the frequency of this radar signal, wherein, the case numerical table of each case shows the frequency at interval between two pulses in the scope that falls into this case representative.
2. the method that is used for the radar protection as claimed in claim 1 wherein has the energy level that rises to above assign thresholds and is recorded with the energy events that drops to the energy level that is lower than described assign thresholds.
3. the method that is used for radar protection as claimed in claim 1 wherein writes down energy events and comprises energy events is detected, adds at least a in timestamp and the journalize.
4. the method that is used for the radar protection as claimed in claim 1 also comprises:
Abandon the not pulse in expected range of width.
5. the method that is used for the radar protection as claimed in claim 4, wherein said expected range is about 1 to 20 microsecond.
6. the method that is used for the radar protection as claimed in claim 1 also comprises:
In the described histogram bins of periodically resetting any one.
7. the method that is used for the radar protection as claimed in claim 6, any one in the wherein said histogram bins is reset once for about each hundred milliseconds.
8. the method that is used for the radar protection as claimed in claim 1, further comprising the steps of:
Periodically remove the oldest clauses and subclauses in any one in the described histogram bins.
9. the method that is used for radar protection as claimed in claim 8 wherein is older than about 750 milliseconds clauses and subclauses and is removed by in from described histogram bins any one.
10. radar protection device comprises:
Be configured to write down the acceptor circuit and the receiving antenna of energy;
Transtation mission circuit and transmitting antenna; And
Be coupled to the processor of described acceptor circuit and described transtation mission circuit, this processor is configured to: the mistiming of calculating in the energy events that writes down exists with definite pulse; Interval between the pulse is categorized in the histogram bins, and each case is represented the scope in two time intervals between the pulse; And when the case number in one or more casees is counted above selected case, determine to detect radar signal and made described transtation mission circuit limit the network traffics on the frequency of this radar signal, wherein, the case numerical table of each case shows the frequency at interval between two pulses in the scope that falls into this case representative.
11. also being configured to write down, radar protection device as claimed in claim 10, wherein said receiving antenna and described acceptor circuit have the energy level and the energy events that drops to the energy level that is lower than described assign thresholds that rises to above assign thresholds.
12. radar protection device as claimed in claim 10 wherein writes down energy events and comprises energy events is detected, adds at least a in timestamp and the journalize.
13. radar protection device as claimed in claim 10, wherein said processor also are configured to abandon the not pulse in expected range of width.
14. radar protection device as claimed in claim 13, wherein said expected range are about 1 to 20 microsecond.
15. radar protection device as claimed in claim 10, wherein said processor also are configured to periodically to reset in the described histogram bins any one.
16. radar protection device as claimed in claim 15, any one in the wherein said histogram bins is reset once for about each hundred milliseconds.
17. radar protection device as claimed in claim 10, wherein said processor also are configured to periodically remove the oldest clauses and subclauses in the described histogram bins any one.
18. radar protection device as claimed in claim 17 wherein is older than about 750 milliseconds clauses and subclauses and is removed by in from described histogram bins any one.
19. a device that is used for the radar protection comprises:
Be used to write down the device of energy events;
Be used for calculating the device of mistiming to determine that pulse exists of the energy events of record;
Be used for the interval between the pulse is categorized into the device of histogram bins, each case is represented the scope in two time intervals between the pulse; And
Be used for case number in one or more casees and surpass the device of having determined to detect radar signal when selected case is counted and having limited the network traffics on the frequency of this radar signal, wherein, the case numerical table of each case shows the frequency at interval between two pulses in the scope that falls into this case representative.
20. the device that is used for the radar protection as claimed in claim 19 wherein has the energy level that rises to above assign thresholds and is recorded with the energy events that drops to the energy level that is lower than described assign thresholds.
21. the device that is used for radar protection as claimed in claim 19 wherein writes down energy events and comprises energy events is detected, adds at least a in timestamp and the journalize.
22. the device that is used for the radar protection as claimed in claim 19 also comprises:
Be used to abandon the not device of the pulse in expected range of width.
23. the device that is used for the radar protection as claimed in claim 22, wherein said expected range is about 1 to 20 microsecond.
24. the device that is used for the radar protection as claimed in claim 19 also comprises:
Be used for any one device of periodically resetting described histogram bins.
25. the device that is used for the radar protection as claimed in claim 24, any one in the wherein said histogram bins is reset once for about each hundred milliseconds.
26. the device that is used for the radar protection as claimed in claim 19 also comprises:
Be used for periodically removing the device of old clauses and subclauses in any one of described histogram bins.
27. the device that is used for radar protection as claimed in claim 26 wherein is older than about 750 milliseconds clauses and subclauses and is removed by in from described histogram bins any one.
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| US10/910,682 US7230566B2 (en) | 2004-08-03 | 2004-08-03 | Radar protection device for wireless networks |
| US10/910,682 | 2004-08-03 |
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| CN101084455A CN101084455A (en) | 2007-12-05 |
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| CN (1) | CN100582813C (en) |
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| US7436352B2 (en) | 2008-10-14 |
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| EP1784660A2 (en) | 2007-05-16 |
| US7230566B2 (en) | 2007-06-12 |
| WO2006026029A2 (en) | 2006-03-09 |
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| CA2577303A1 (en) | 2006-03-09 |
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